Governor for reciprocating engines



Nov. 24, 1936. Aa GARELLI 2,062,000

GOVERNOR FOR RECIPROCAT'ING ENGINES Filed March 11 1933' ZSheets-Sheet 1 Fig.1

178-22 Zerlo 6427a [Z1 Nov. 24, 1936. GARELU 2,062,000

eovrsnuon FOR RECIPHOCATING ENGINES Filed March 10, 1933 2 Sheets-Sheet 2 Fig.

rfzforny Patented Nov. 24, "1936 UNITED-STATES PA'IUENT OFFICE I v I oovnaru'nz. 15t;i511}; t rrnocarried Adalberto Garelli, mum, Italy Application March 10, 1933, Serial him-660,303

' In Italy March 25, 1932 1 Claims. (c1. 264

and in certain cases also the weight of the crank shaft and consequentlythe weight of the engine. According to the invention the centrifugal mass 1 or each of the centrifugal masses is pivoted in a recess provided in a groove or notch of a radial extension of the shaft lying inthe plane of one arm of the crank (crank disc or counterweight), the said mass comprising an arm extending 15 toward the axis for acting on an element axially movable relatively to the crank shaft and connected to the member which the governor should control and which is subjected to the action of an antagonistic spring. 0 On the annexed drawings two embodiments of the present invention are illustrated by way of example and JFigure 1 is a fragmentary section of the end portion of the crank case of a reciprocating engine provided with a governor according to the present invention;

Figure'2 is a section on line 2-2 of Fig. 1; Figure 3 is a similar section of a construction of a governor comprising symmetrical centrifu- 30 gal masses and Figure 4 is the section on line 44 of Figure 3. In the embodiment of Figures 1 and 2 the counterweight l of the engine crank shaft 2 mounted to rotate in the engine crank case 3 35 is provided with a recess 5 located along the diameter passing through the crank pin 4, and a centrifugal mass 1 is eccentrically pivoted within said recess by, means of a pivot pin 6.

Said mass 1 has an extending arm 8 which 40 projects towards the axis of shaft 2- and a stem I3 is mounted to move endwise within an axial hole 9 of said shaft, said stem being actuated by 'arm 8 by the intermediate of roller ll, disk In and ball thrust bearing I2.

45 A lever l5 fulcrumed in a fork l8 fastened on the crank case 3 receives by the intermediate of its roller l'l the thrust of stem I3 whose end extends outwardly from the crank case through a bored plug i4, and imparts said thrust, by means 50 of bar Hi, to a member controlled by the governor, say to the throttle of the engine carbureter, not shown. As shown in Fig. 1 of the drawings, a coil spring i9 is positioned between the lever l5 and the casing of the engine which 5 serves to return the parts of the governor to trifugal mass of the governor.

their normal position and to counteract the cen- This structure is similar to that disclosed in the U. S. patent to Parsons, No. 1,454,402.

Owing to the described arrangement the gov- 5 ernor is entirely enclosed within the crank case and the centrifugal mass 1 cooperates to provide a balancing counterweight for the crank shaft while the several parts are perfectly lubricated by lubricant contained within the crank case. 10

By the described and illustrated arrangement the mass is pivoted adjacent the periphery of the crank arm or counterweight and acts on the endwise movable member ID with a comparatively large leverage.

Thus a sufliciently long stroke of the said member I0 and of its cooperating stem l3 may be obtained even in respect of very restricted oscillations of said mass, the displacements of the mass above referred to being thus unable to materially affect the balance of the crank shaft.

Figures 3 and 4 illustrate a similar arrangement comprising two symmetrical masses 1, l pivoted ateccentric points thereof within recesses 5, 5 of the crank arm by means of pivot pins 6, 6'; arms 8, 8' control by the cooperation of the described means the endwise movable member ID which in turn actuates the stem l3 acting on the outer lever l5; in this construction the masses 1, I lie ina plane at right angles to the radius on which the crank pin 4 is located.

In this case advantages similar to above described ones are secured, with the exception that the centrifugal masses do not cooperate to provide the balancing counterweight which therefore is not longer subject to any alteration whatsoever due to the oscillation of the governor masses.

I claim as my invention:

1. In a reciprocating engine, an engine control member, a ,crank case, a crank shaft having a 4 crank arm and mounted to rotate in said case, said crank shaft comprising a part extending radially from the shaft in the plane of the crank arm adjacent a wall of the case and having at least one recess extending in radial direction, a mass eccentrically pivoted in each recess about an axis perpendicular to the axis of said crank shaft and adjacent the periphery of the radially extending part of the shaft, each mass having an arm directed toward the axis of said shaft, said 5 crank shaft having an axial bore through its portion on the side of said radially'exte'nding Dart,

means operative through said axial bore for transmitting motion from said arm of the mass to the control member, and elastic means opposing the 56 movement of said mass under the action of centrifugal force.

2. In a reciprocating engine, an engine control member, a crank case, a crank shaft having a crank arm and mounted to rotate in said case, said crank shaft comprising a part extending radially from the shaft in the plane of the crank arm adjacent a wall of the case and having at least one recess extending in radial direction, a mass eccentrically pivoted in each recess about an axis perpendicular to the axis of said crank shaft and adjacent the periphery of the radially extending part of the shaft and the side of said part remote from said wall, each mass having an arm directed toward the axis of said shaft, said crank shaft having an axial bore therethrough. means operative through said axial bore for I transmitting motion from said arm of the mass io the control member, and elastic means opposing the movement of said mass under the action of centrifugal force. I

3. In a reciprocating engine, an engine control member, a crank case, a crank shaft having a crank armand mounted to rotate in said case, said crank shaft comprising a part extending radially from the shaft in the plane of the crank arm adjacent a wall of the case and having at least one recess extending in radial direction, a

mass eccentrically pivoted in each recess about an axis perpendicular to the axis of said crank shaft and adjacent theperiphery of the radially extending part of the shaft and the side of said part remote from said wall, each mass having its center of gravity near the periphery of the radial extension of the shaft and having an arm directed toward the axis of said shaft, said crank shaft having an axial bore therethrough, means operative through said axial bore for transmitting motion from said arm of the mass to the control member, and elastic means opposing the movement of said mass under the action of centrifugal force.

4. In a reciprocating engine, an engine control member, a crank case, a crank shaft having a crank arm and mounted to rotate in said case, said crank shaft comprising a part extending radially from the shaft in the plane of the crank arm adjacent a wall of the case and having at least one recess extending in radial direction, a mass eccentrically pivoted in each recess about an axis perpendicular to the axis of said crank shaft and adjacent the periphery of the radially extending part of the shaft, the distance between the center of gravity of the centrifugal mass and its pivot being substantially less than the distance between the axis of the pivot and the axis of the crank shaft, each mass having an arm directed toward the axis of said shaft, said crank shaft having an axial bore through its portion on the side of said radially extending part, means operative through said axial bore for transmitting motion from said arm of the mass to the control member, and elastic means opposing the movement of said mass under the action of centrifugal force.

5. In a reciprocating engine, an engine control member, a crank case, a crank shaft mounted to rotate in said case and comprising a counterweight having a recess extending in radial direction, a mass eccentrically pivoted in said recess about an axis perpendicular to the axis of said crank shaft and adjacent the periphery of the counterweight, said mass having an arm directed toward the axis of said shaft, said crank shaft having an axial bore therethrough, means I trol member, and elastic means opposing the movement of said ,mass under the action of centrifugal force.

6. In a reciprocating engine, an engine control member, a crank case, a crank shaft having a crank arm and mounted to rotate in said case, said crank shaft comprising a part extending radially from the shaft in the plane of the crank arm and having two opposed recesses extending in radial direction, two masses each eccentrically pivoted in one of said recesses about an axis per pendicular to the axis of said crank shaft and adjacent the periphery of the radially extending part of the shaft, each mass having an arm directed toward the axis of said shaft, said crank shaft having an axial bore therethrough, means operative through said axial bore for transmitting motion from said arm of the mass to the control member, and elastic means opposing the movement of said mass under the action of centrifugal force.

7. In a reciprocating engine, an engine control member, a crank case, a crank shaft having a crank arm and mounted to rotate in said case, said crank shaft comprising a part'extencling radially from the shaft in the plane of the crank arm adjacent a wall of the case and having two opposed recesses extending in radial direction, two masses each eccentrieally pivoted in one of said recesses about an axis perpendicular to the axis of said crank shaft and adjacent-the periphery of the radially extending part of the shaft and the side of said part remote from said wall, each mass having an arm directed toward the axis of said shaft, said crank shaft having an axial bore therethrough, means operative through said axial bore for transmitting motion from said arm of the mass to the control member, and elastic meansppposing the movement of said mass under the action of centrifugal force.

ADALBERTO GARELLI. 

